As a motorcyclist, I have to say that the best thing a 4-wheeler can do is to maintain speed and refrain from quick lane changes. You should do that whether it's a car or bike!
Give us distance if you come up on us. Even in your 911 (mine too), you won't be able to stop as quickly as we can.
If you happen to be in a lane next to us and we don't speed up or slow down, you might consider speeding up or slowing down (better) so you are not side to side. Even motorcyclist, when riding in a group, should ride staggered. If I have to change lanes quickly with you next to me (I hope I have scanned my area though), I'll make an ugly hood ornament. This is a good practice in a car too (staggered formation).
A motorcyclist can weave within his lane. Don't be alarm, just stay alert. I weave in my lane to make sure I don't get lost in the scenery. I do it when approaching an intersection so the driver will notice my headlights when I flick from one side of my lane to the other. I ride with my high beams during the day so the drivers will see me. It's not to piss you or other 4-wheelers off.
Common sense is common sense on two wheels or not...
We can share!